Fig. 9 Sectional View of E7 Brake Valve
NUT, Spring Seat
GUIDE, Stem Spring
PISTON, Lower Static
SPRING, Primary Piston Return
SPRING, Relay Piston Return
PISTON, Upper Static
VALVE, Secondary Inlet & Exhaust
VALVE, Primary Inlet & Exhaust
Install O-rings on relay piston (13) and primary
Position rubber spring (9), concave side down, in
primary piston (8) and place spring seat (6), flat
side up, over rubber spring.
Install spring seat nut (2) on primary piston with
hex head closest to spring seat and rotate nut
clockwise until top surface of spring seat is even
with top surface of piston (8).
Position relay piston spring (14), which is lighter
of the two piston return springs, relay piston (13),
primary piston spring (11) and primary piston (8)
in lower static piston (10). Compress both
primary and secondary pistons in lower static
piston. Hold them manually or mechanically.
A screwdriver may be used by inserting it through a
rectangular opening in static piston
into locking groove (20) in primary piston.
Insert stem (1) through exhaust passage of relay
and primary pistons and engage a screwdriver
with slot in head of stem; then position stem
spring (3), spring guide (4) on spring seat nut
Compress guide spring assembly and install lock
nut (5) on stem. Torque nut to 2.3 -3.4 N.m (20 -
30 in lbs).
Torque is a specified value for assembly;
after assembly, torque value will fall off.Do
Remove screwdriver from lower static piston
CTS-4079 - CHAPTER Page 10